This was an interesting historic mystery. I was unaware that it was the second in a series, but not having read the first one did not slow down my understanding of this one. I loved how vividly the settings were written, how down to earth the writing style was, and how unique each of the characters was. It also seems like a significant amount of research in to both the language and the history of the Netherlands was done. The only thing that I did not love was that it took a bit too long for the action to truly start. I felt like we were 40% of the way through the book before I understood what the plot was. The voice of the narrator was strong and well rounded, and the book was overall an enjoyable read.

4.25 Stars
1674, Leiden, The Netherlands
After successfully solving the case of the missing girls in Delft, Master Mercurius has made a name for himself as a private investigator. With unrest occurring both nationally and internationally, William of Orange is obsessed by plots against his leadership. He calls on Mercurius to help to spy on state officials. But before Mercurius has a chance to investigate, his colleague at the University of Leiden is killed. Then one of William’s men is also murdered, Mercurius suspects there could be a serial killer on the loose.
Another very well written fast paced story from the author. This is the second book featuring Mercurious & it could easily be read on its own. I really like Mercurious, his manner & humour makes for an easy to read book & the pages flew by. I loved how Mercurious solved everything - I certainly didn't work it out. I look forward to more in this enthralling series
My honest review is for a special copy I voluntarily read